Fearing uncertainty/changes at work

My company is getting a new CEO in two weeks. Although part of me is excited, another part of me is very fearful about losing my job or not being able to navigate the changes in store.

I was reading about their history. At the past two companies where they were CEO, they laid off the entire leadership team as well as large amounts of staff. I recognize I’m collecting evidence for my thought about potentially losing my job and ruminating about what the future holds–not exactly productive. How can I get out of this thought loop? I know I want to show up feeling capable, certain, and clear.